Liquid filter



cfr. L 1940., w. MAUTZ 2Z646 LIQUID FILTER Filed-oct. 21, 1938 l 2sheets-sheet. 1.

,19 I glo/$19. Z

aveluta: WOLJFGANQ MAUT Z Oct. 1, 1940. w, MAUTZ 2,216,646

LIQUID FILTER Filed obi. 21, 1938 2 sheets-sneer, 2

. Tzvevfoq WoLfeANe MAuTz l Patented Oct. 1,Y 1940 uNifi-ED STATES-PATENT -oFFicE LIQUID FILTER.

Wolfgang Mautz, Kronberg, Taunus, neaxl Frankfort-on-the-Main, GermanyApplication October 21, 1938, Serial No. 236,338 In Germany October 21,1937 2 Claims.

y annular enlargements extending in the same direction and provided atthe inner and outer edges of the clamping discs, so that a'hollow spaceis formed between the filtering-material and the plate of the clampingdisc. The clamping disc located under the filtering material is providedat its outer edge with openings for the admission of liquid into theiilter chamber, and the disc located above the ltering material isprovided with corresponding openings 90 in the inner ,edge for the outowof the liquid which has been purified by the interposed lteringmaterial. Y

The disadvantage of this construction is that when assembling theseparate iilter chambers, 2 two clamping discs come to lie adjacent oneanother without an interposed layer of filtering material which formspacking. In'a practical construction the bottom and top clamping discsare connected together, for example by rivets.

330 These rivets also serve to 'press together the'discs which, foreconomizing in space, are made as thin I as possible and consequentlyhave very little rev sistance to distortion, and therefore in general donot lie atupon one another so tightly as to prevent a passage of liquidbetween them.

Experience, however, has shown that an effective packing is impossible.When using'these lters on fine working machines, forv example grindingmachines, the lne grinding slime passes between the clamping discs andespecially through the rivet holes. The neness ofiiltering desired insuch a case is so great that even fine textures are unsuitable, 'andfilter paste-boards are used. The eiiiciency of the entire deviceisvtherefore questionable when provision is not made that no soiledliquids whatsoever can pass through a separate passage into the streamof liquid which has already been puriiied, and thus nullify the 50trouble and time which has been taken up in obtaining an extremely highdegree. of filtering. In addition, the assembling of the discs istedious and an effective rigid connection between two 55 the resilientplates tend to press the rivet condiscs is practically impossible, aswhen assembling,

(CL 21o-169) l nection apart and in the course of time loosen the same.Y

Filter supporting discs are known which are Aso constructed that theyserve both as the cover for one filter chamber and the bottom of theiilter 5 chamber located next. above. These discs are, however, ofshapes which do not permit oi any resiliency therein, which isabsolutely necessary both for the correct clamping of the iilteringmaterial and also for obtaining an effective packing lo f between theseparate chambers.

' According to the invention these difficulties are eliminated in thateach clamping disc is prc ided with four or more annular enlargementsarranged coaxially and extending upwardly and downward- 15 ly in pairsfrom the clamping disc plate, and forming the supporting surfaces forthe adjacent clamping disc.

`In this manner it is possible, even in the case of discs which arethemselves resilient and clamp go the iiltering material in a levelplane, to so shape the discs that a single disc forms both the cover ofone iilter chamber and the `bottom of the chamber located next above. f

The drawings illustrate examples of filters ac- 25 cording to theinvention:

Figure 1 shows the arrangement of the clamping discs in a filter casing;

Fig. 2 shows the arrangement of the liquid openings in the discs for asingle filtration; and 30 Fig. 3 shows the position of the liquidopenings for a double iiltration.

In Fig. 1 the filter, indicated generally by the reference numeral I,consists of a cover v2 bearing the iilter insertion, and a casing 3 forthe liquid. 35

v'I'he liquid to be ltered is fed to the casing 3 through an opening 4,fills the interior of the casing 3, and is drained off through a centraloutlet 5 after having passed through iilter chambers 26, 28 formed byclamping discs III and the o intermediate filtering material 34. Apivoted outlet 6 brings the iiltered liquid to the place of consumption.Instead of the arrangementand mounting of 'the filter pile shown in thedrawings,

other arrangements are possible.

The clamping discs III shown in Fig. 2 consist of centre plates I5having upwardly and down-l wardly bent parts I4, I6 arranged at an angleto the plate I5. Thebent parts are reversely bent\ or curved to formlannular collarsl I3, Il to support succeeding clamping discs. Coaxiallyto the collars I3, I1 are arranged other annular collars II, I9vconnected to the collars I3, Il by parts I2, I8 extending in oppositedirections to the parts II, I6. The arrangement of the annular collarsare formed by similarly shaped clamping discs I0 arranged in reverseddirection about the intermediate filtration material 34. y k Accordingto whether single, double or multiple ltering is desired, the clampingdiscs are provided with dierently located liquid openings.

, In an appliance for single filtration, the disc I0 has an inletopening 25 in the outer part I8. The liquid to beA puried passes throughthis opening into chamber 26 and from here it passes through thefiltration material 34 into the chamber 26, from which it passes throughopenings 29 into chamber 30 and finally through outlet 3I on the innerangular face of the clamping disc to the filter outlet. Openings 32 inthe clamping plate parts I5 enable the liquid immediately after enteringthe chamber 26 to pass into the chamber 33,V from which, after passingthrough the lter material 34, it enters the chamber 21 and finallyreaches the outlet openings 3I.

Thus the liquid iiow, after entering the filter chamber, can be dividedinto two streams, one 0f which passes upwards and the other downwardsthrough the next layer of filtration material.

The clamping discs are provided within the ribs or collars I3 and I1,with liquid openings 29, 32 of convenient position and with alternatelydisposed inlet openings 25 in the outer part I8, and

Aoutlet openings 3| in the part I2.

When a double ltration is desired, as shown in Fig. 3, the clamping disc35 is provided with an opening 36 in the outer rib or collar I8. Theliquid enters the chamber 31, passes through the filtration material 38into the chamber 39 and after passing through openings 40 in anintermediate clamping disc 4I it passes into a chamber 42 from which,after traversing a further filter disc 43, it reaches a chamber 44 fromwhich it can flow oif through an opening 45 in the inner rib or collarI2 of the clamping disc 46.v 'I'he clamping plate 46 has a furtheropening 36 in the outer collar I8 to enable rthe liquid lflow to reachthe upper chamber system. Furthermore, the clamping plate 35 isperforated at the outer collar I8 and inner collar I2 to ensure thedraining off of the lower stream of liquid. The arrangement of theliquid openings for double ltering is generally made in such a mannerthatan intermediate disc 4I is introduced between the perforated discs35, 46 whereby a partial stream of liquid can enter through the part I8and a partial stream can pass out'through the part I2,

the disc 4I being provided with suitably located openings 4U between thecollars I3 and I1.

I claim:

1. A flexible clamping disc for a pile filter said disc having a centralopening, an intermediate flat annular web portion, an annular clampcollar portion of V-shape in cross-section with unequally long limbsbetween said central opening `and said intermediate flat portion, asimilar clamp collar between the said intermediate ilat portion and theexternal periphery of the disc, said annular clamp collarportionsprojecting in opposite directions from the plane of said intermediateilat portion to provide two annular clamping surfaces on each side ofthe disc, the

.external angles of the V-shaped parts forming' non-cutting clampingsurfaces for flltermaterial, and a plurality of flow control openingsbeing provided in said disc located in at least two of the surfacesprovided by the limbs of said collars and said flat intermediateportion.

2. A pile filter comprising a casing, a plurality of flexible clampingdiscs according to claim 1 piled coaxially and in superposed relation insaid casing alternate discs being inverted whereby the pairs .of annularclamping surfaces of adjacent vdiscs Aare in clamping relationship witheach other, plates of iilter material clamped between said edges andradially tensioned by elastic deformation of said discs, means in saidcasing for `engaging the lowermost clamping disc by means WOLFGANGMAUTZ.

